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Securities Owned and Securities Sold, But Not Yet Purchased - Additional Information (Detail) (USD $)
In Thousands |
Jun. 30, 2012
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Dec. 31, 2011
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|---|---|---|
| Schedule of Trading Securities and Other Trading Assets [Line Items] | ||
| Securities owned deposited with the Company's subsidiaries clearing broker | $ 448 | $ 542 |
| Securities owned at fair value | 1,336 | 2,014 |
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Common stock and warrants | Fair Value, Inputs, Level 2 | Warrants to purchase common stock
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| Schedule of Trading Securities and Other Trading Assets [Line Items] | ||
| Securities owned at fair value | 575 | 1,005 |
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Common stock and warrants
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| Schedule of Trading Securities and Other Trading Assets [Line Items] | ||
| Securities owned at fair value | $ 328 | $ 191 |